Yuwu Coal Industry Co,Lu.an Group

为了研究地质构造对脉动水力压裂过程和效果的影响,在地质构造区和非地质构造区分别进行脉动水力压裂现场试验,分析了两种情况下脉动水力压裂过程和效果的不同。结果表明:断层构造断面在压裂区域形成弱面区,很容易诱导煤层裂隙向断层方向扩展,脉动水则不断向断层方向运动,脉动注水时间和注水量均明显大于非地质构造内的脉动水力压裂,对瓦斯抽采产生较大的水锁效应,阻止了瓦斯运移的动力学过程;断层自然卸压区使脉动水力压裂过程中压力无法升高,降低了脉动水力压裂的效果;地质构造降低了脉动水力压裂前后稳定抽采瓦斯浓度增量,提高了初始抽采瓦斯浓度的增量。

In order to study the impact of the geological structure on the process and effect of pulsating hydraulic fracturing(PHF),the industrial experiments of PHF is carried out in the tectonic zone and the non-tectoniczone respectively,then the difference of the process and effect of pulsating hydraulic fracturing in the two casesis analyzed.The results show:The fault structure brings out a weak surface in pulsating hydraulic fracturing area,easily inducing seam crack extension to the fault,and pulsating water continuously moves towards the direction of fault.The pulsating water injection time and injection volume of of PHF in the tectonic zone are significantly larger than those in the non-tectonic zone,which has a large water blocking effect on gas drainage andhinders the dynamic process of gas migration; The natural pressure relief zone of the fault prevents the pulsation pressure from rising during hydraulic fracturing process,which reduces the effect of PHF; The geologicalstructure reduces the increment of stable gas drainage concentration before and after PHF,and improves the initial concentration of gas drainage.

河北省自然科学基金资助项目(E2022508023)

郝军 .地质构造对脉动水力压裂过程及效果的影响[J].华北科技学院学报,2023,20(6):55-60

HAO Jun.Impact of geological structure on process and effect of pulsating hydraulic fracturing [J].Journal ofNorth China Institute of Science and Technology,2023,20(6):55-60